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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Summary of Activity in Accrued Rebates and Chargebacks, Returns, Wholsesaler Service Fees and Prompt Pay Discounts | The following table provides a summary of activity with respect to the Company’s sales related allowances and accruals for the years ended December 31, 2018, 2017 and 2016 (in thousands):
| Returns Allowances |  | Prompt Payment Discounts |  | Wholesaler Service Fees |  | Volume Rebates and Chargebacks |  | Total
Balance at December 31, 2015 | $ | 1,733 |  |  | $ | 625 |  |  | $ | 745 |  |  | $ | 797 |  |  | $ | 3,900 |
Provision | 694 |  |  | 5,448 |  |  | 4,118 |  |  | 2,611 |  |  | 12,871 |
Payments/Adjustments | (1,081 | ) |  | (5,478 | ) |  | (4,128 | ) |  | (2,284 | ) |  | (12,971 | )
Balance at December 31, 2016 | 1,346 |  |  | 595 |  |  | 735 |  |  | 1,124 |  |  | 3,800 |
Provision | 716 |  |  | 5,806 |  |  | 4,403 |  |  | 4,656 |  |  | 15,581 |
Payments/Adjustments | (1,241 | ) |  | (5,744 | ) |  | (4,299 | ) |  | (5,084 | ) |  | (16,368 | )
Balance at December 31, 2017 | 821 |  |  | 657 |  |  | 839 |  |  | 696 |  |  | 3,013 |
Provision | 680 |  |  | 6,802 |  |  | 5,194 |  |  | 6,645 |  |  | 19,321 |
Payments/Adjustments | (1,157 | ) |  | (6,680 | ) |  | (4,866 | ) |  | (6,331 | ) |  | (19,034 | )
Balance at December 31, 2018 | $ | 344 |  |  | $ | 779 |  |  | $ | 1,167 |  |  | $ | 1,010 |  |  | $ | 3,300 |
Disaggregation of Revenue | The following table represents disaggregated net product sales in the periods presented (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Net product sales: |  |  |  |  |
EXPAREL | $ | 331,112 |  |  | $ | 282,905 |  |  | $ | 265,802 |
Other product sales | 1,315 |  |  | 1,437 |  |  | 4,271 |
Total net product sales | $ | 332,427 |  |  | $ | 284,342 |  |  | $ | 270,073 |

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